Referencing the image being touched - ios

Question

In my viewDidLoad function I have a loop creating a 3x6 table of square images (blocks) . The idea is to move and match them eventually.
My question is, how do I assign the current image that is being touched or dragged, as a variable? Here's how I'm adding the image:
let squareImg = UIImageView(image:#imageLiteral(resourceName: "square"))
view.addSubview(squareImg)
And here is what I'm attempting to do:
#IBAction func handlePan(_ recognizer: UIPanGestureRecognizer) {
let translation = recognizer.translation(in: self.view)
if recognizer.state == UIGestureRecognizerState.began {
isDragging = true
let objectDragging = self.view //this is wrong and what I'm trying to correct
print("bg color of block being moved \(objectDragging?.backgroundColor)")
....

Answer 1

Store the images in an array, assign their index to the tag value, screw touchesBagan etc. and simply use gesture recognizers.
Adding images becomes:
var myImages = [UIImage]()
let squareImg = UIImageView(image:#imageLiteral(resourceName: "square"), tag: [//add a distinguished tag here])
view.addSubview(squareImg)
myImages.append(squareImg)
Now that your views are in an array (they don't need to be UIImageViews or even UIImages, just something unique), simply point to the correct thing in your array:
#IBAction func handlePan(_ recognizer: UIPanGestureRecognizer) {
let translation = recognizer.translation(in: self.view)
for view in self.subviews as [UIView] {
if let imageView = view as? UIImageView {
let image = myImages.tag
}
}
}
I'm aware this isn't exactly what you are asking for. But the technique is. I'll adjust my answer based on your feedback.
EDIT:
Based on the comments, it sounds like a good strategy going forward is to at least populate the tag property with "associated pairs in some kind of loop. Additionally, it sounds like some sort of build error is happening. Here's my take on that issue....
Tag properties are available to every object, be they a view or control. Also, they are of Int type. The last comment states the error references an incorrect argument in a function call, expecting an image. I think two separate things are going on.
(1) Populating the tag property for "associated" images in a loop.
If you are loading a "square" and a "circle" n number of times, instantiate things in a loop with an index and populate their tag property.
for index in 0...10 {
// instantiate your images
// associate these images by populating their tag values
imgSquare.tag = index
imgCircle.tag = index
// continue any other set here
}
Loop types in Swift are natively Int, so this is correct.
(2) The incorrect reference build error.
The build error is on line
let circleImg = UIImageView(image: circle, tag: [arrayCounter])
This is not a "canned" initializer for UIImageView, and from the build error it's not (yet) a coded extension to UIImageView. It sounds like there is a coded extension to UIImageView, one that expects two arguments, image and highlightedImage. If you want extend UIImageView for something like this, I'd create an extension with a convenience initializer:
extension UIImageView {
convenience init(image: UIImage, tag:Int) {
self.init()
self.image = image
self.tag = tag
}
}
This is a skeleton. You can add a guard statement and make it a bailable initializer. You can add frames, backgroundColor, whatever. The thing is - you currently do not have an initializer calling for 'image:tag:' but you are coding for one.

Answer 2

just try this
let objectDragging = recognizer.view

Answer 3

You could use the overrides provided by UIImageView.
For Example,
class DragImag: UIImageView {
var draggedView: UIView?
override init(frame: CGRect) {
super.init(frame: frame)
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
}
override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?){
//here you get your desired view
draggedView = touches.view
}
override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?){
}
}